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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include <sys/panic.h>
#include <sys/cpuvar.h>
#include <sys/limits.h>
#include <os/kalloc.h>
#include <os/spinlock.h>
#include <machine/mdcpu.h>
#include <string.h>
#include <limine.h>
extern struct pcore g_bsp;
static size_t ncores_up = 1;
static struct pcore *corelist[CPU_MAX];
static struct spinlock lock;
/*
* We'll use the bootloader to keep the kernel small
*
* XXX: Maybe move this somewhere better?
*/
static volatile struct limine_smp_request g_smp_req = {
.id = LIMINE_SMP_REQUEST,
.revision = 0
};
__dead static void
ap_entry(struct limine_smp_info *)
{
struct pcore *pcore;
spinlock_acquire(&lock);
pcore = kalloc(sizeof(*pcore));
if (kalloc == NULL) {
panic("mp: could not allocate pcore\n");
}
/* Initialize the core */
memset(pcore, 0, sizeof(*pcore));
pcore->id = ncores_up;
cpu_conf(pcore);
cpu_init(pcore);
corelist[ncores_up++] = pcore;
spinlock_release(&lock);
for (;;);
}
void
bsp_ap_startup(void)
{
struct limine_smp_response *resp = g_smp_req.response;
struct limine_smp_info **cpus;
struct mdcore *mdcore;
uint32_t ncores, tmp;
/* Sanity check */
if (__unlikely(resp == NULL)) {
panic("mp: could not get SMP response\n");
}
/* Put the AP list in a known state */
memset(corelist, 0, sizeof(*corelist));
corelist[0] = &g_bsp;
/*
* If the number of cores total exceeds the cap we have
* set in sys/limits.h, truncate what we start up and
* log it so any inconsistencies have a definitive
* source.
*/
cpus = resp->cpus;
ncores = MIN(resp->cpu_count, CPU_MAX);
if (resp->cpu_count >= CPU_MAX) {
tmp = (resp->cpu_count - ncores - 1);
printf("mp: not starting %d cores\n", tmp);
}
/* Don't continue if we have only one core */
if (ncores == 1) {
printf("mp: single cored CPU - no APs to bring up\n");
return;
}
printf("mp: bringing APs online...\n");
mdcore = &g_bsp.md;
for (int i = 0; i < ncores; ++i) {
if (mdcore->apic_id == cpus[i]->lapic_id) {
continue;
}
cpus[i]->goto_address = ap_entry;
}
while (ncores_up < ncores);
printf("mp: %d cores [up]\n", ncores - 1);
}
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